$today = date("l");

<?php
  $today = date("l");
 query_posts(array(
 'post_type' => '',
 'posts_per_page' => 4,
 'meta_key' => 'eventdate',
  'meta_key' => 'thursday',
   'orderby' => 'meta_value',
   'order' => 'ASC',
    'meta_query' => array(
      array(
         'key' => 'eventdate',
       'meta-value' => $value,
       'value' => $today,
       'compare' => '>=',
       'type' => 'CHAR'// you can change it to datetime also
   )
  )
   ));

'meta_key' => 'thursday',